Add yet-another-react-lightbox package and update .gitignore to exclude node_modules

frontend/node_modules/react-dnd-html5-backend/dist/utils/js_utils.js

@@ -1,30 +0,0 @@
-// cheap lodash replacements
-export function memoize(fn) {
-    let result = null;
-    const memoized = ()=>{
-        if (result == null) {
-            result = fn();
-        }
-        return result;
-    };
-    return memoized;
-}
-/**
- * drop-in replacement for _.without
- */ export function without(items, item) {
-    return items.filter((i)=>i !== item
-    );
-}
-export function union(itemsA, itemsB) {
-    const set = new Set();
-    const insertItem = (item)=>set.add(item)
-    ;
-    itemsA.forEach(insertItem);
-    itemsB.forEach(insertItem);
-    const result = [];
-    set.forEach((key)=>result.push(key)
-    );
-    return result;
-}
-
-//# sourceMappingURL=js_utils.js.map